(a) A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.
Advantages
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A computer specification has the following details:
Give two reasons why optical disks are better storage media compared to floppy diskettes31/12/2020 Give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)
 (a) State two tasks of a processor (2mks)
(b) State the functions of I/O devices
Define the term Computer Aided Design.
(b) List three advantages of using Computer Aided Design.
What is meant by freeware?
(b) State two ways of acquiring freeware.
Distinguish between the following:CRT and LCD, OCR and OMR.
(a) CRT :- A display unit built around the vacuum tube containing one or more electron guns whose electron beams rapidly sweep horizontally across the inside of the front surface of the tube which is coated with a material that glows when irradiated. WHILE
LCD : - A type of display that uses a liquid compound having a polar molecular structure. sandwiched between two transparent electrodes. When an electric field is applied, the molecules align with the field forming a crystalline arrangement that polarizes the light passing through it. A polarized filter laminated over the electrodes locks polarized light. In this way, a grid of electrodes can selectively tum on” a cell,, or a pixel, containing the liquid crystal material turning it dark. (b) OCR :- Type of scanning technology that reads special pre-printed characters and converts then into computer usable form, while OMR :-Scanning technology that reads pencil marks and converts them into computer usable form. 
Describe an input device.
(b) Other than scanning devices, name two other input devices.
(a) (i) What is a computer keyboard? (1mk)
Input device with keys for keying in data in the form of characters
List four types of keys found on a computer keyboard. Give an example of each. (4mks)
(a) List five precautions that can be taken to protect data stored in diskettes (5mks)
Explain the following input/ output terms as used in computer systems. Give an example for each30/12/2020 Explain the following input/ output terms as used in computer systems. Give an example for each (4mks)(a) Read- get data from memory e.g. opening a file
(b) Write – put data into memory e.g. saving Some of the storage disk available are: zip disks, 3 ½ inch floppy disks, DVDs and 5 ¼ inch floppy disks. Arrange these devices in ascending order of storage capacity.
List four ways of acquiring software in an organization
Define authenticity as used in software selection
List two examples of:Third generation languages and Object oriented languages
b) List and explain three types of user interfaces.
c) Describe the following categories of software: i) Firmware ii) Proprietary software d) a new company XYZ intends to go into the business of desktop publishing. Advise the company on three computer hardware system specification features to consider as a measure of enhancing performance.
(a) One of the functions of an operating system is job scheduling.
Explain what is meant by job- scheduling Running of a particular job/ task under a system of priority, computer resource availability, time allocated to user etc. (b) List and explain three types of user interfaces
The diagram below shows a formatted plate surface of a storage disk.
Shade and label:
a) one sector b) One block 
Describe the purpose of each of the following computer functional units(a) ControlEssentially governs all the computer activities and monitors the execution of programs. (b) StorageTo holds internally before and after processing. Divided into two i.e. primary and secondary Primary holds data and information being handled by the CPU. Secondary stores data and information in a more permanent form 
Explain the following software terms: Portability and Modularity
(a)Portability
Ability of a software to work/ function in several computer hardware and O/S platforms (b)Modularity Ability of software to be broken down into several sections for easier understanding and maintenance. 
Differentiate between COM ports and LPT ports
(a) The diagram below represents the essential features of a computer system. Study the diagram and answer the questions that follow:
(i) Name the components: (4mks)Describe the functions of the following computer hardware components:
computer mouse
flatbed scanner
Compare the two types of diskettes used in microcomputers in terms of physical size and densities.27/12/2020
Compare the two types of diskettes used in microcomputers in terms of physical size and densities.
A firm intends to purchase new software. List three items that should accompany the software26/12/2020 (a) A firm intends to purchase new software. List three items that should accompany the software (3mks)
Differences between system software and application softwareSystem Software
Unix OS is an example of system software
System software refers to a set of instructions/codes/programs/applications designed to control hardware resources of a computer, performance, communications and manufacturer’s settings.
They also act as an interface between the user of application software and hardware resources. Examples include:
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